First of all, demanding something be fixed will only make your situation worse. FreeSO is being developed by ONE guy, and he's got a life outside of the game to worry about. Second, the server is very fragile and there will occasionally be rollback when the server goes offline for whatever reason. This is a Beta, and we're basically bug testers. Expect it to happen a lot, and expect plenty of other glitches and malfunctions as well.
I'm afraid the only thing I can suggest is you earn back that money lost, because I'm not a mod and I guarantee the folks in charge won't help you with that attitude. Sorry.